A dramatic marble hearth anchors a living room by Waldo’s Designs .

A sleek sitting area by Jean-Louis Deniot showcases modern art, placed in alcoves that flank the fireplace.

Designer Emily Summers’s own family retreat at the Eldorado Country Club in Indian Wells, California, features a smart dining room.

This serene bath by Aero Studios includes a seat by the window.

A limestone-paved gallery by David Kleinberg Design Associates showcases the homeowners’ art collection.

This master bedroom features a Veere Grenney Associates ebonized four-poster.

In this Manhattan apartment by Juan Montoya Design , an undulating white wall is the backdrop to several sculptures.

Reclaimed-oak ceiling beams add a rustic touch to a crisp and clean kitchen by Darryl Carter Inc.

Contemporary art hangs above simple white furniture in a Jacques Grange–designed living room.

A sunny master bath by Victoria Hagan Interiors is lined in marble.

Tony Ingrao and Randy Kemper of Ingrao Inc. worked with the owner of this downtown Manhattan apartment on finishes, furnishings, and window treatments.

Paintings of Long Island are grouped in a master bath by Carrier and Company Interiors .

Calacatta gold marble and glass-front lacquered cabinetry give this Steven Volpe–designed master bath a cool sheen.

In a master suite by Thierry Despont Ltd. , the walls are upholstered in neutral fabrics, and a lyrical Murano-glass chandelier hangs overhead.